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Differences in Aggressive Behavior Across Grade Levels

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A researcher ws interested in the differences in aggressive behavior across grade levels. They selected two samples to compare: a group of first graders at a public school and a group of 5th graders from a private school. The researcher measured the number of times each child hit another during 30 minute playground interactions. The results showed no differences between first graders and fifth graders. The researcher concluded that there are no grade diferences in aggressive behavior.

what research design was used in this study?
what is the independent variable in this study?
What is the dependent variable in this study?
How did the researcher operationally define the dependent variable?
What scale of measurement was used to measure the dependent variable?
What scale of measurement was used to meausre the independent variable?
What is one obvious confounding variable in this study?

Please explain how you determined answer. I am struggling with how to determine ind and dep variable's. I appreciate your help.

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Solution Summary

The differences in aggressive behavior across grade levels are examined.

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1. This is a descriptive study, also called observational study, because the study was done by observing the subjects without otherwise intervening.

2. The independent variable is the grade level. This is the independent variable because it is the variable that could affect the dependent variable and it answers the question "What do I change?".

3. The dependent variable is aggressive behavior ...

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